Signature quantization, representations of compact Lie groups, and a q-analogue of the Kostant partition function

Details Signature quantization, representations of compact Lie groups, and a q-analogue of the Kostant partition function Signature quantization, representations of compact Lie groups, and a q-analogue of the Kostant partition function

2004-05-19

arxiv.org/abs/math/0405379v1

Mathematics

Combinatorics

21 pages; part of the second author's Ph.D. thesis (MIT, 2004); a condensed version was submitted to the Proceedings of the Na

Scientific paper

We discuss some applications of signature quantization to the representation theory of compact Lie groups. In particular, we prove signature analogues of the Kostant formula for weight multiplicities and the Steinberg formula for tensor product multiplicities. Using symmetric functions, we also find, for type A, analogues of the Weyl branching rule and the Gelfand-Tsetlin theorem. These analogues involve a q-analogue of the Kostant partition function. We show that in type A, this q-analogue is polynomial in the relative interior of the cells of a complex of cones. This chamber complex can be taken to be the same as the chamber complex of the usual Kostant partition function. We present the case of A_2 as a detailed example.

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